Malicious PDF — malware analysis report

Static analysis result for SHA-256 824ebbe9deeb9de8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 23:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d2668ae8ef2a314b9b4effc03a855ca SHA-1: 326b4485ec9f60b3f07efa7ea1e2de51e07cf9f0 SHA-256: 824ebbe9deeb9de830695131ea7c725ae62e9442fa43b5dc6c8a167a259497d3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document likely attempts to trick users into revealing sensitive information such as private keys or backup codes. The presence of numerous links to compromised CMS uploads and disposable hosting further supports a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0713feb0924fd246d5775f14f64352aa/vejitolewafikujorigo.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d53rq7tssqmv266lldcrevt9b1/garajazefek.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210820000708.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634b5c2a9a---18540951840.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/65397712321.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/jukajatotazafarizawer.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7a46d945ed81288922d6cfba3ce0f0d6/18981144511.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q9dm37sobpf9g72vp0depu6g2d/4045243189.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eb70a192bb18d86a93ad40c95120a189/5718426787.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/132f0651ffed130d1616451905da2bfe/2008823037.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vebufuwusovo.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/fizajuwufagufogolikobabes.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba063d50f30---37122286165.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ibe5p2h5kja6hf6erg15kmmm0q/88858503146.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e98da24765dfe72fbc5b53671b0811cd/3095338399.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdc7564bf---54037828360.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/25736252344.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5us8rrqo5u1138g115omjncpce/nojomizod.pdfIn PDF document text
    • http://dd-eng.com/files/files/ledoveve.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609059b54231a---12548214230.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pdkqqfb5potod0dp69ek9h9687/xovofajeguzoti.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750fad4ad20---kaxudiratobokadanu.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/dofarikafide.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/65521224201.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/23514285164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+peer+to+peer+network+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 17696 bytes
SHA-256: 6d1ccb7bb7ab465a2118ddb229242fbff5ce64935add1ec8d0106f023bdf38bf
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 10444 bytes
SHA-256: be1aa762bf224a8805b62a4e053edc1e4d471e27c934eb8dcf9f06e588f4c12e
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1